Pete.
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- Kent, UK
This is the wiring diagram that came with my Student, don't know if it helps or not.
View attachment 265631
To me that looks like the low and high speed windings are separate like they were on my Newman motor. If that's the case you could run a VFD on one winding, if'n you could find the star point.
Personally I'd either fit another motor or put it back together and use a converter.